Threading and curling device for metal caps



July 14, 1925. 1,545,533 T. L. TALIAFERRO THREADING AND CURLING DEVICEFOR METAL CAPS Filed March 16, 1925 27w TOQ. 11 $6 jg J] 16 f Z0 (20 2J3 [wen ran Patented July 14, 1925.

UNITED STATES PATENT OFFICE.

- THOMAS L. 'I'ALIAFERBO, OF CHICAGO, ILLINOIS, ASSIGNOR TO PHOENIXHERMETIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK.

THREADING AND CURLING DEVICE FOR METAL CAPS.

Application filed March 16, 1923. Serial No. 625,634.

To allwhom it may concern:

Be it known that I, THOMAS L. TALIA- FERRO, a citizen of the UnitedStates, residing at Chicago, in the county of Cook, State of Illinois,have invented certain new and useful Improvements in Threading andCurling Devices for Metal Caps, of which the following is a description,reference being had to the accompanying drawing, and to the figures ofreference marked thereon.

The invention relates to new and useful improvements in threading andcurlingdevices for metal caps, and more particularly to threading andcurling rolls which cooperate to simultaneously thread the flange of ametal cap and curl the lower edge thereof.

An object of the invention is to provide a threading and curlingmechanism wherein the curling sections may yield relative to each otherindependently of the threading sections to accommodate varyingthicknesses of metal whereby the edge may be properly curled and threadsrolled in the flange of the cap of proper depth;

A further object of the invention is to provide a threadingmechanismconsisting of inner and outer threading rolls, each of which isprovided with a curling section, a threading section and a knurlingsection, wherein the outer threading roll is so constructed that thecurling section can yield to excessive pressure if the thickness in themetal should va so that threads of uniform depth may e rolled eventhough the thickness of the metal from which the cap is made shouldvary.

These and other objects will in part be obvious and will in part behereinafter more fully disclosed.

In the drawings which show by way of illustration- Figure 1 is a viewshowing an inner and outer threading roll embodying my improvements, theouter threading roll being sectioned to show the manner of mounting thecurling section, the threading rolls being spaced from each other;

Fig. 2 is a view similar to Fig. 1, but showing only a part of the loweror inner threading roll and the two rolls in engagement with the cap forthreading and curling the edge thereof;

ig. 3 is a section on the line 33 of Fig. 1, Ind

Fig. 4 is a section on the line 44 of Fig. 1.

The invention is directed broadly to a threading mechanism for threadingand curling the edge of a metal cap. In carrying out the invention, Iuse two cooperating thread rolls. The cap is first blanked out so as toprovide a body portion having a. depending flange, the lower edge ofwhich extends outwardly substantially at right angles to the flange.This blank is placed on the inner threading roll, after which the outerthreading roll is brought into rolling contact with the inner threadingroll, and the threads rolled in the flange at the same time that theedge of the cap is curled. I also prefer to use a knurling section whichsimultaneously knurls the flange as it is threaded and curled. Indevices of this character which have been heretofore used, the curlingsection and the threading section of each roll are rigidly supported sothat they movetoget-her, but have no independent movement relative toeach other. It will readily be seen that when the edge of the cap isrolled, if the thickness of the metal increases, the roll is going to beslightly increased. This increased thickness of metal will limitthe'inward movement of the outer curling section. Inasmuch as thethreading section has heretofore been made rigid with the curlingsection, the inward movement of the threading section will also belimited by the thickness of the metal in the curl and this will preventthe rolling of the threads of uniform and proper depth. 7

The invention is directed particularly to the mounting of the threadingand curling sections on the outer roll, so that they may have a yieldingmovement relative to each other. I prefer to mount the curling sectionso that normally it is concentric with the center of rotation of theroll, but under excessive pressure, said outer'curling section iscapable of lateral movement of the roll so .as to permit the threadingsection to move into proper cooperative action with the threadingsection of the inner roll so as to roll the threads in thecap of properde th.

The invention possibly will be better un erstood by a reference to thedrawings which show one way of carrying out the invention.

The cap blank from which the threaded cap is formed is indicated at 1 inFig. 1 of the drawings. Said blank has a depending flange 2, the lowered e of. which is bent outwardly at right ang es as indicated at 3. Thepu ose of the invention is to form this flange o the cap with a thread,and at the same time to roll this outwardlyextending part 3 into a curl.In Fig. 2 of the drawings, the finished cap is shown and the flange 2 isshown as provided with a thread i, and the ed e is turned outwardly intoa curl 5. In t e forming of this curl, the metal is rolled so as toconceal the raw edge of-the metal, and it will be'readily seen that thesize of the curl will be in a measure determined by the thickness of themetal. In other words, if the metal should increase in thickness, thecurl would increase slightly in thickness.

providedan inner threading roll 6 and an outer threading roll 7. Thesethreading usual construction.

rolls are mounted in the well known way so that they are rotated, andthe outer threading roll is given a bodily movement toward and from theinner threading roll. The inner threading roll is provided with aknurling section 7, a threading section 8 andan anvil 9 which supportsthe outwardly turned flange 3 while it is being rolled into a" curl.Thls inner threading roll is of the The outer threading roll consists ofa body portion 10 which carries a knurling section 11. This knurlingsection 11 is in the form of a ring freely mounted on the body portion10 as is common practice in the forming of threading rolls.- 7 Adjacentthe knurling ring is a threading section 12 and adjacent the threadingsection 12 is a curling section 13.- The parts are held assembled on thebody portion by a headed bolt 14. The threading section 12 is rigidlymounted on the body portion 10 by reason of the fact that each threadingsection is formed with a central opening which rests on and fits againstthe shoulder 15 on the body portion, so that this threading section hasno lateral movement whatever on the body portion 10. This is not true ofthe curling section 12. The shouldered part 16 passes through an opening17 in the curling section which is larger in diameter than theshouldered part 16. This curling section is free to move laterally onthe body portion 10 between the body portion and the headed bolt 14. Itslateral movement however, is limited by yielding means which as hereinshown consists of a series of pins 18, each of which is provided with aconical end 19, and a spring 20 housed in a recess containing the insnormally forces the pins outwardly, t at is, to the right as shown inFig. 1. In the rear face of the curling section there is an annulargroove 21, see Figures 2 and 4. This groove is V-shaped in cros sectionand conforms to a' cross section of the end of the conical pins. I

It will readily be seen that this curling section can be moved laterallyto the position shown in Fig. 2, the pins yielding and sliding up theinclined wall of the annular groove. The spring pressure back of thepins, however, pressmg on the inclined wall, will force the curlingsection back to normal concentric position when the lateral pressure onthe curling section is relieved.

As is well known in this art, the blank' from which the threaded cap isto be formed is placed on the inner roll as shown in Fig.

1. The outer roll which is rotating as well as the inner roll movesbodily into engagement with the cap and suflicient pressure is exertedon the roll to cause the metal to be threaded and curled. As has beenstated above, if the thickness of the metal varies, the'curl is bound toincrease in diameter and thus limit the movement of the curling sectionof the outer roll. If this curling section of the outer roll is rigidlymounted so that it has no lateral movement, the limiting of the movementof the curling section would likewise limit the movement of thethreading section, andtherefore the threads would not be impressed inthe flange of the cap to a uniform extent.

By my improvement, however, this outer curling section will yield underexcessive.

would again hold the outer threading. roll oil and prevent the properforming of the threads. By my improvement however, the variation istaken care of and the threads rolled of uniform depth.

Then again, it has been very diflicult to form the outer threading rollso as to roll the curl and roll the thread of proper depth, and therolls require constant attention and checking up so as to maintain theproper proportion of the parts to accompllsh the result desired. By myimprovement, however, wherein the curling section is capable of findingits proper relative position so as to turn a full curl, and at the sametime permit threads to be rolled into the cap of full depth, suchaccuracy in manufacturmg and such careful attention to maintain theproper roportions is not necessary.

t will be understood of course, that the III metal caps including innerand outer rolls having cooperating threading and curling sections, andmeans for supporting the curling section of the outer roll whereby thesame can yield independently of the threading section of the outer roll.

2. Threading and curling devices for metal caps including inner andouter rolls having coo erating threading and curling sections, saidouter threading roll comprising a body portion, means for rigidlymounting the threading section on said body portion, and means formounting the curling section on said body portion whereby it may yieldlaterally to excessive pressure.

3. Threading and curling devices for metal caps including inner andouter rolls having cooperating threading and curling sections, the outerthreading roll comprising a body portion, means for rigidly mounting thethreading section on said body portion, means for confining the curlingsection from endwise movement of the roll, and means for yieldinglysupporting said curling section whereby it may be moved laterally of thebody portion under excessive pressure.

4. Threading and curling devices for metal caps including inner andouter rolls having cooperating threading and curling sections, the outerthreadin roll comprising a body portion, a threadlng section rigidlymounted on said body portion, a curling section, spring pressed pins onwhich sections, the outer thread ing roll comprising a body portion, aknurling ring freely mounted on the body portion so as to rotateindependently of the body portion, a threading section rigidly mountedon the body portion, and a curling section yieldingly mounted on saidbody portion whereby said curling section may move laterally of the bodyportion under excessive pressure.

6. Threading and curling devices for metal caps including inner andouter rolls having cooperating threading and curling sections, the outerthreading roll comprising the body portion, a threading section rigidlymounted on the body portion, a curling section secured to the bodyportion so that it may move laterally of the body portion, said curlingsection having an annular groove, V-shaped in cross section in the rearface thereof, spring pressed pins having conical ends adapted tonormally register with said annular groove and hold "said curlingsection in concentric position on the body portion, said pins yieldingto excessive.

pressure so that said curling section may move laterally of the bodyportion.

7. Threading and curling devices for metal caps including inner andouter rolls having cooperating knurling, threading and curling sections,said sections on the inner roll being rigidly supported thereon, the

'knurling section on the outer roll being free torotate thereon, thethreading section on' the outer roll being rigidly mounted thereon, andthe curling section on the outer roll being yieldingly mounted thereonso that it can move laterally of the axis ofthe outer threadin rollunder excessive pressure.

In testimony whereof, I afiix m si ature.

THOMAS L. TALIATE R0.

